Owing a "co.cc" domain -- bad new -- now, when you google for any domains that match [site:co.cc] and you will find no matches. Reason, Google has removed, deindexed, banned and penalized any site using a co.cc subdomain.
Why? "Google reserves the right if they "see a very large fraction of sites on a specific freehost be spammy or low-quality, we do reserve the right to take action on the freehost as a whole," Matt Cutts explained on Google+.
Google's JohnMu did offer some advice for those who were hit why they feel they should not have been:
If you feel that your particular site is in line with our Webmaster Guidelines, I would recommend submitting a reconsideration request. Additionally, if you use a subdomain on a widely used domain name, and feel that your subdomain provider is not up to par with regards to preventing and handling abuse quickly -- be it webspam, phishing, or malware -- you may wish to look into ways of remedying that.